Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Nomeie a classificação da equipe para a etapa 20.
 ###Tabelas: CREATE TABLE mexico_under-20_managers (mexico_under-20_managers_id AUTO_INCREMENT PRIMARY KEY, Manager VARCHAR, Mexico career VARCHAR, Played INT, Drawn INT, Lost INT, Win % INT) CREATE TABLE classification_leadership (classification_leadership_id AUTO_INCREMENT PRIMARY KEY, Stage VARCHAR, Winner VARCHAR, General classification VARCHAR, Points classification VARCHAR, Mountains classification VARCHAR, Young rider classification VARCHAR, Team classification VARCHAR, Combativity award VARCHAR) CREATE TABLE timeline_of_tallest_buildings_and_structures (timeline_of_tallest_buildings_and_structures_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Location VARCHAR, Years as tallest VARCHAR, Height metres / ft VARCHAR, Floors VARCHAR) CREATE TABLE 2011_junior_manx_grand_prix_practice_times__&__leaderboard (2011_junior_manx_grand_prix_practice_times__&__leaderboard_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Rider VARCHAR, Sat 20 Aug VARCHAR, Mon 22 Aug VARCHAR, Tues 23 Aug VARCHAR, Wed 24 Aug VARCHAR, Thurs 25 Aug VARCHAR, Fri 26 Aug VARCHAR) CREATE TABLE busiest_international_routes (busiest_international_routes_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Airport VARCHAR, Passengers INT, Aircraft Movements INT, Carriers VARCHAR)  
SELECT Team classification FROM classification_leadership WHERE Stage = 20